Chapter 9 Muscle Histo Phys

Chapter 9 Muscle - Muscle Tissue Alternating contraction and relaxation of cells Chemical energy changed into mechanical energy 10-1 3 Types of

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10-1 Muscle Tissue Alternating contraction and relaxation of cells Chemical energy changed into mechanical energy
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10-2 3 Types of Muscle Tissue Skeletal muscle attaches to bone, skin or fascia striated with light & dark bands visible with scope voluntary control of contraction & relaxation
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10-3 3 Types of Muscle Tissue Cardiac muscle striated in appearance involuntary control autorhythmic because of built in pacemaker
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10-4 3 Types of Muscle Tissue Smooth muscle attached to hair follicles in skin in walls of hollow organs -- blood vessels & GI nonstriated in appearance involuntary
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10-5 Functions of Muscle Tissue Producing body movements Stabilizing body positions Regulating organ volumes bands of smooth muscle called sphincters Movement of substances within the body blood, lymph, urine, air, food and fluids, sperm Producing heat involuntary contractions of skeletal muscle (shivering)
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10-6 Properties of Muscle Tissue Excitability respond to chemicals released from nerve cells Conductivity ability to propagate electrical signals over membrane Contractility ability to shorten and generate force Extensibility ability to be stretched without damaging the tissue Elasticity ability to return to original shape after being stretched
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10-7 Skeletal Muscle -- Connective Tissue Superficial fascia is loose connective tissue & fat underlying the skin Deep fascia = dense irregular connective tissue around muscle Connective tissue components of the muscle include epimysium = surrounds the whole muscle perimysium = surrounds bundles (fascicles) of 10-100 muscle cells endomysium = separates individual muscle cells All these connective tissue layers extend beyond the muscle belly to form the tendon
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10-8 Connective Tissue Components
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10-9 Nerve and Blood Supply Each skeletal muscle is supplied by a nerve, artery and two veins. Each motor neuron supplies multiple muscle cells (neuromuscular junction) Each muscle cell is supplied by one motor neuron terminal branch and is in contact with one or two capillaries. nerve fibers & capillaries are found in the endomysium between individual cells
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10-10 Fusion of Myoblasts into Muscle Fibers Every mature muscle cell developed from 100 myoblasts that fuse together in the fetus. (multinucleated) Mature muscle cells can not divide Muscle growth is a result of cellular enlargement & not cell division Satellite cells retain the ability to regenerate new cells.
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10-11 Muscle Fiber or Myofibers Muscle cells are long, cylindrical & multinucleated Sarcolemma = muscle cell membrane Sarcoplasm filled with tiny threads called myofibrils & myoglobin (red-colored, oxygen-binding protein)
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10-12 Transverse Tubules T (transverse) tubules are invaginations of the sarcolemma into the center of the cell filled with extracellular fluid carry muscle action potentials down into cell Mitochondria lie in rows throughout the cell near the muscle proteins that use ATP during contraction
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This note was uploaded on 06/06/2011 for the course BIO 180 taught by Professor Sarahbales during the Spring '11 term at Moraine Valley Community College.

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Chapter 9 Muscle - Muscle Tissue Alternating contraction and relaxation of cells Chemical energy changed into mechanical energy 10-1 3 Types of

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